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The National Phosphorus Project rainfall simulator was used to quantify overland flow and P transport from nine sites distributed throughout the watershed of a New York City Watershed Agriculture Program collaborating dairy farm. Observed concentrations of total dissolved phosphorus (TDP) were low (0.007-0.12 mg L(-1)) in flow from deciduous forest,(More)
The Linux® kernel is unique in that it supports a wide variety of high-quality filesystems. For server systems, the most commonly used are Ext2, Ext3, ReiserFS, XFS and JFS. This paper compares the performance of these filesystems using Linux 2.4.17 and three benchmarks: pgmeter, an open source implementation of the Intel® Iometer benchmark; filemark (a(More)
He joined the University of Arizona faculty in 1967 and has taught classes in basic soils, soil morphology and classification, and soil and water conservation from 1967 until the present. His research has been in soil morphology and classification, and in using remotely sensed data to map soils and other natural resources. R. B. Bryant is a research(More)
Phosphorus (P) losses from agricultural landscapes arise from the interaction of hydrologic, edaphic, and management factors, complicated by their spatial and temporal variability. We monitored sites along two agricultural hillslopes to assess the effects of field management and hydrology on P transfers in surface runoff at different landscape positions.(More)
High levels of accumulated phosphorus (P) in soils of the Delmarva Peninsula are a major source of dissolved P entering drainage ditches that empty into the Chesapeake Bay. The objective of this study was to design, construct, and monitor a within-ditch filter to remove dissolved P, thereby protecting receiving waters against P losses from upstream areas.(More)
Little is known about the fate of arsenic (As) in land-applied litter from chickens that have been fed roxarsone, an organic feed additive containing As. This study seeks to elucidate the transfer of As in runoff from ditch-drained soils of the poultry-producing region of the Delmarva Peninsula by tracking As and phosphorus (P) export from seven drainage(More)
PenguinoMeter is a new open-source benchmark for Linux that measures file-system data transfer rates. PenguinoMeter allows the user to specify the file-system workload to be used in the benchmark in a very flexible manner. The workload specification is patterned after that of the Intel® Iometer benchmark; the current version of PenguinoMeter can read(More)
Loss of soil nutrients in runoff accelerates eutrophication of surface waters. This study evaluated P and N in surface runoff in relation to rainfall intensity and hydrology for two soils along a single hillslope. Experiments were initiated on 1- by 2-m plots at foot-slope (6%) and mid-slope (30%) positions within an alfalfa (Medicago sativa(More)
RP3, or Research Parallel Processing Prototype, was the name given to the architecture of a research vehicle for exploring the hardware and software aspects of highly parallel computation. RP3 was a shared-memory machine designed to be scalable to 512 processors; a 64 processor machine was in operation for two and half years starting in October 1988. The(More)
Authors retain copyright to all submitted papers, but have granted unlimited redistribution rights to all as a condition of submission. Abstract The SGI® Altix™ 3000 family of servers and superclusters are nonuniform memory access systems that support up to 64 Intel® Ita-nium® 2 processors and 512GB of main memory in a single Linux image. Altix is targeted(More)